/*
 * Copyright (C) 2014 jsonwebtoken.io
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *     http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */
package com.apache.jwt.impl.crypto;

import com.apache.jwt.SignatureAlgorithm;
import com.apache.jwt.lang.Assert;

import java.security.Key;

public class DefaultSignatureValidatorFactory implements SignatureValidatorFactory {

    public static final SignatureValidatorFactory INSTANCE = new DefaultSignatureValidatorFactory();

    public SignatureValidator createSignatureValidator(SignatureAlgorithm alg, Key key) {
        Assert.notNull(alg, "SignatureAlgorithm cannot be null.");
        Assert.notNull(key, "Signing Key cannot be null.");

        switch (alg) {
        case HS256:
        case HS384:
        case HS512:
            return new MacValidator(alg, key);
        case RS256:
        case RS384:
        case RS512:
        case PS256:
        case PS384:
        case PS512:
            return new RsaSignatureValidator(alg, key);
        case ES256:
        case ES384:
        case ES512:
            return new EllipticCurveSignatureValidator(alg, key);
        default:
            throw new IllegalArgumentException(
                    "The '" + alg.name() + "' algorithm cannot be used for signing.");
        }
    }
}
